Are there any known cases of these exisiting. I am not saying that I have one I am just wondering if they exist. The reason why I am asking is I have noticed when roll searching that the 90% silvers are usually alot "whiter" on the edge and the rest of the coin than the 40% ers. I have found a few 40% ers that are in extremely good shape. They look like someone busted them out of a set and turned them in.
The 90% silver half weighed 12.5 grams, +/- 0.26 , whereas the 40% halves weighed 11.5 +/- 0.40 grams. The non silver clad 1971 weighed 11.34 +/- 0.454 grams. Although it would not be possible to be positive by weight alone between the 40% and the clad, you should be able to do so by weight between the 90% and the 40% or clad, assuming the 90% wasn't badly worn and the 40% similar shape. Jim
All the half dollars in the Silver Proof Sets beginning in 1992 are of the 90% Silver alloy. Some copper nickel coins have been silver plated but to the best of my knowledge, no 90% silver half's exist between the years 1965 and 1991. 40% coins but no 90% coins.
There are some few examples known of '65 & '66 90% silver halfs, and 90% silver quarters. But they are few and far between and considered to be wrong planchet errors. These have been confirmed and certified. There have been reports of some '67 examples, but none have been confirmed to my knowledge.
I suppose that is possible since the 1964 Half's were produced well into 1966 but as I said, to the best of my knowledge (which just took a step forward).
Why would anyone bother posting one?? The '64 Kennedy's were all 90% silver;they are all over my junk box.
Back to the OP's original observation, yes, 90% coins should have a different appearance on the edge because they are solid 90% Silver coins. The 40% Kennedy's have an 80% copper/20% Silver core which has a tendence to turn a brackish dull grey due to the copper content.
